Crispy-Edged Croque Monsieur Croissant Strata

Name: Crispy-Edged Croque Monsieur Croissant Strata
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 5 min
Yield: 8 servings
Ingredients: 1 tbsp unsalted butter; 6 large day-old croissants; 6 large eggs; 1.5 cups whole milk; 0.5 cups crème fraîche; 2 tbsp Dijon mustard; 0.25 tsp freshly grated nutmeg; 1 tsp kosher salt; 0.5 tsp black pepper; 8 oz smoked ham; 6 oz Comté cheese; 1 tbsp fresh thyme leaves

Day-old croissants deserve better than the trash bin. We are soaking them in a sharp Dijon and Comté custard to build a high-impact, low-fuss brunch bake. The result is the aggressive crunch of a Parisian croque monsieur with a tender, wobbly center—because we're not suffering for brunch.

Camille Roux

July 5, 2026

Prep: 20 minutes

Cook: 45 minutes

easy

breakfastlunch

savory-bakingsunday-brunchcroissant-stratacustard+2

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Timeline

1 hour 15 minutes

0m15m30m45m1h1h15

Preheat & Grease

Toast Croissants

Whisk Custard

Assemble Strata

Pour Custard

Rest Strata

Bake Covered

Bake Uncovered

Cool & Serve

Ingredients

1 tbsp unsalted butter(room temperature, for greasing)
6 large day-old croissants(about 12 oz total, stale is best)
6 large eggs
1.5 cups whole milk
0.5 cups crème fraîche(heavy cream works too)
2 tbsp Dijon mustard(smooth, not grainy)
0.25 tsp freshly grated nutmeg
1 tsp kosher salt
0.5 tsp black pepper(freshly cracked)
8 oz smoked ham(thick cut, torn into bite-sized pieces)
6 oz Comté cheese(coarsely grated)
1 tbsp fresh thyme leaves

Instructions

1
Preheat oven to 375°F (190°C). Grease a 9x13-inch baking dish with 1 tbsp unsalted butter.
5 min
Tip: Butter is not a garnish. Coat the sides well to prevent the custard from sticking and to encourage crispy edges.
2
Tear 6 large day-old croissants into large, craggy chunks. Scatter them on a baking sheet and toast lightly in the warming oven to dry them out further.
8 min
Tip: Cami's shortcut note: If your croissants are already rock hard, skip the toast. If they're just slightly stale, this quick trip ensures they absorb the custard without turning into a tight, mushy paste.
3
While croissants toast, whisk 6 large eggs, 1.5 cups whole milk, 0.5 cups crème fraîche, 2 tbsp Dijon mustard, 0.25 tsp freshly grated nutmeg, 1 tsp kosher salt, and 0.5 tsp black pepper in a large bowl until completely smooth.
5 min
Tip: You want zero streaks of egg white. The crème fraîche adds a subtle culture and richness that milk alone cannot provide.
4
Scatter half the toasted croissants into the buttered dish. Layer with 4 oz smoked ham, 3 oz Comté cheese, and 0.5 tbsp fresh thyme leaves. Repeat the layers with the remaining croissants, the remaining 4 oz smoked ham, remaining 3 oz Comté cheese, and remaining 0.5 tbsp fresh thyme leaves.
5 min
Tip: Don't slice the ham perfectly. Torn, jagged edges curl up and crisp in the oven.
5
Pour the custard evenly over the layered croissants. Press down firmly with your hands.
2 min
Tip: Don't skip this. You want every craggy edge submerged so the custard penetrates deep into the lacy crumb.
6
Let the strata rest at room temperature while the oven finishes preheating.
20 min
Tip: Let time do the work. The croissants need to drink.
7
Cover the dish tightly with aluminum foil and bake.
25 min
Tip: Foil creates a steam bath, cooking the custard gently before the top burns.
8
Remove the foil. Continue baking until the top is deeply golden, the edges pull away slightly from the pan, and the center has a gentle wobble.
20 min
Tip: Look for a confident jiggle, not a liquid wave. The crags should look aggressively browned.
9
Remove from the oven and let it stand before slicing.
10 min
Tip: If you cut it piping hot, the custard will weep. Give it a minute to pull itself together.

Chef's Notes

Cami's shortcut note: You can assemble this entirely the night before. Keep it wrapped in the fridge. In the morning, let it sit on the counter while the oven preheats, then bake as directed. A cold retard actually improves the custard absorption, keeping the crumb lacy rather than tight like a bad alibi.

Frequently Asked Questions

How long does Crispy-Edged Croque Monsieur Croissant Strata take to make?

Crispy-Edged Croque Monsieur Croissant Strata takes about 1 hour 5 minutes total. That includes 20 minutes of prep and 45 minutes of cooking.

How many servings does this recipe make?

This recipe makes 8 servings.

What skill level is needed for Crispy-Edged Croque Monsieur Croissant Strata?

This recipe is rated easy — it's beginner-friendly and straightforward.

What ingredients do I need for Crispy-Edged Croque Monsieur Croissant Strata?

The main ingredients are: unsalted butter, day-old croissants, eggs, whole milk, crème fraîche, Dijon mustard, freshly grated nutmeg, kosher salt, black pepper, smoked ham, Comté cheese, fresh thyme leaves.

What type of meal is Crispy-Edged Croque Monsieur Croissant Strata?

Crispy-Edged Croque Monsieur Croissant Strata is categorized as: breakfast, lunch.

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